Song.—Similar to that of the [Yellow Warbler] but more choppy.
Nest.—In low bushes or weeds, and often in sweet fern or briars; similar to that of the [Yellow Warbler] but coarser, being made more with grasses than with fibres, situated in upright forks or attached to several weed stalks; eggs white, specked around the large end with reddish brown (.68 × .50).
Range.—Eastern N. A., breeding from New Jersey and Ohio north to Manitoba and New Brunswick; winters south of U. S.
BAY-BREASTED WARBLER
660. Dendroica castanea. 5½ inches
Male, with crown, throat and sides rich chestnut; female, paler; young and adults in winter, greenish above, streaked with black and with a trace of chestnut on the flanks.
These Warblers are only locally abundant during migrations, while in eastern New England they are rare. They are active insect hunters, darting rapidly about the tree tops or, less often, in brush; their habits most nearly resemble those of the [Chestnut-sided Warbler].
Song.—A low, liquid warble.
Nest.—At low elevations in trees in swampy woods; compact, cup-shaped structures made of fine shreds of bark, rootlets and grass; eggs bluish white, finely specked around the large end with reddish brown (.70 × .50).